Guard for door-locks



(No Model.)

J. BARTL.

1. GUARD FOR DUUR LOCKS.

No. 583,222. Patented May 25,1897.

UNITED STATES PATENT OFFICE.

JosEPnA BAETL, or CHICAGO, iLLrNoIs.

GUARD FOR DOOR-LOCKS.

SPECIFICATION forming part of Letters Patent No. 583,222, dated May 25, 1897.

Application filed June l5, 1896.

To all whom t may concern:

Be it known that I, JOSEPH BARTL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Guards for Door-Locks,of which the following is a specication.

My invention relates to an improvement in door-locks, more especially of the class known as spring-locks, and has for its object to provide a guard which shall prevent the lockbolt from being forced back by the use of an instrument inserted between the door and door-jalnb.

The preferred means of automatically operating the guard is shown in the accompanying drawings, and consists, brieliy stated, in a plunger held normally to project beyond the face-plate of the lock-casing under the action of a spring and a lever pivoted in the casing and engaging at one end the plunger and at lthe other end a sliding guard-plate. The projecting end of the plunger is beveled, and as the door is closed the beveled portion engages the keeper on the door-jalnb and is forced back into the casing, thus turning the pivoted lever and forcing out the guard, causing itto extend between the bolt and the opposite side of the door.

In the drawings, Figure 1 is a perspective View of a lock provided with my improvement; Fig. 2,a similarviewof akeeper; Fig. 3, a broken horizontal section through the door, jamb-post, lock, and keeper; and Fig. Al, an interior view ofthe casing, showing the working parts, the casing-plate which ts against the door being removed.

A is the lock-Casin g,co1nprisin g,preferably, a housing portion A', provided with a iiange t to give room for the operative parts, and an inner plate or coverin A2, which fits within the iiange and rests upon lugs s, provided for the purpose.

The part A is provided on its interior with lugs r, having screw-holes r', at which points the plate A2 is secured to the casing, and also with a longitudinally-extendin g slot q for the reception of the shank of an operating-handle B for the lock-bolt C. That portion of the ange t of thecasing A which acts as the face-plate t' of the lock is wider than the Serial N0. 595,651. (No model.)

remainder of the flange and is provided near its edge with a slot for the guard-plate and more centrally with openings for the lockbolt C and a plunger E.

C is the spring-held lock-bolt, which slides through the opening in the face-plate in the ordinarymanner and to the shank n of which is attached the operating-handle B. The operating-handle B is provided with a shank l, which extends through vthe slot q in the side of the casingand passes through alongitudinally-sliding strip 7c on the inside of the case, to which it is iirinly attached. At its inner end the shank its loosely into an opening in the lock-bolt C. When the bolt is retracted, the handle B may be turned to turn the strip lo into engagement with a lug, and thereby hold the bolt retracted. As this feature is old in locks of this class and forms no part `of my invention, it is not thought necessary to show or describe it in detail.

D is the guard-plate, having a shank D', which is provided With a pin m and slides upon the inner face of the covering-plate A2.

E is the plunger, which works Within the aforesaid opening in the face-plate of the casing and through an opening in one of the lugs r, as indicated. The plunger is held, under v the action of a spring E', to project normally beyond the face-plate of the casing, as shown in Fig. 4, and is provided at its shank with a pin h.

, F is a lever pivoted toward its center upon l a standard g, which is a part of the casing A' and of sufficient length to correspond with the opening in the face-plate of the casing provided for the guard-plate D. The lever has its ends slotted to receive the pins 'm h upon the guard-plate DA and the plunger E, respectively. I/Vhen the plunger E is forced in, the pin 7L engages the lever F, and the latter, through the medium of the pin on, forces out the guard-plate D, and when the plunger is released the spring E' forces it out and draws back the guard-plate.-

Fig. 2 shows a keeper G, which I prefer to provide with an inclined surface f to contact with thebeveled surface of the plunger E and force the latter in when the door is closed.

The lock shown is intended for use upon the inner side of a chamber-door. The plate IOO the medium of the plunger and lever,as stated. v

Owing to the relative positionsof the plunger and guard-plate the latter will not be forced out till it has passed Within the keeper, thus adapting it particularly to a swinging door.

It is evident that the manner of arranging and operating a movable guard for the purpose`stated may be variously modified Without departing from the Spirit of my invention. 4 Hence I do not Wish to be understood as in f any sense limiting my improvement to the particular construction shown.

IVhat I claim as new, and desire to secure by Letters Patent, is-

l. In a door-lock, the combination with the casing, bolt, bolt-operating mechanism and keeper, of a plunger in the casing extending normally beyond the casing face-plate to engage and be retracted by the keeper when the door is closed, and a movable guard-plate for the bolt, normally retracted and operatively connected with the plunger whereby it is advanced by the retraction of the plunger, substantially as and for the purpose set forth.

2. In a door-lock, the combination With the casing, bolt, bolt-operating mechanism, and keeper, of a guard-plate for the bolt reciprocable through an opening in the face-plate of the casing, a pivoted lever in the casing engaged toward one end by the guard-plate, and a spring-held plunger engaging said lever toward its opposite end and extending normally beyond the face-plate of the casing to engage andbe retracted by the keeper to project the guard-plate when the door is closed, substantially as and for the purpose set forth.

3. In a door-lock, the combination with the casing, bolt, and bo1t-operating mechanism, of a guard plate for the bolt reciprocable through an opening in the face-plate of the casing, a lever pivoted toward its center in the casing, a pn-andfslotconnection between the guard-plate and lever, a springheld plunger projecting normally beyond the casing, and engaging said lever through the medium ot' a pin-and-slot connection, and a keeper having a plunger retractng face, all constructed and arranged to operate substantially as described.

JOSEPH BARTL.

In presence of- J. H. LEE, R. T. SPENCER. 

